Arc-light electrode containing metal within the same.



.110; 880,055. 'PATENTED FEB. 25, 1908.

' H. VIERTEL.

ELECTRODE CONTAINING METAL WITHIN THE SAME.

ARC LIGHT APPLICATION FILED APR.16. 1907' s'rnrns lllCRMA XX VIERIEL, Ob llllARLOTTENBURG, GERMANY, ASSIGNOR, TO GEBRUDER SIEMENS d: (10., Ol" OHARLOTTENBURG, GERMAN-Y, A CORPORA'llON OF GERMANY.

ARC-LIGHT ELECTRODE CONTAINING METAL WITHIN THE SAME.

Specification of Letters Patent.

Patented. Feb..25, 1908.

Application filed Aprillfi. 1907. Serial No. 368.594.

To all whom it may concern:

Be it known that I, HERMANN VIERTEL, a subject of the German Emperor, and resident of (lharlottenburg, near Berlin, Germany, have invented a certain new and useful Improvement in Arc-Light Electrodes Containing Metal Within the Same,- of which the following is a specification. I

The present invention relates, to arc-light electrodes and an important objept is to provide an arc-light electrode containing metal within. the same. I

Metal has hitherto frequently been employed in arc light electrodes for reducing the resistance of the same, but in the metho in accordance with the' present invention metal in the form of woven or laced net-like pipes or tubes is inserted into the carbons for the electrodes. Themeshes of these reticulated metallic tubes are as completely as possible filled up with conducting carbon cement or with core material as is used for the cores of carbons for electric'arc lamps. \Nhen finished hard cores are employed in making arc-light electrodes, it is preferable to place the metallic tube between the outer carbon casing and the core, thus concentrically with the core. The manufacture of such a1'c-liglit electrodes mayffor example, be eilected by" the metal tube being pushed on to the hard core in the form of a rod. By pulling in the direction of the longi tudinal axis of the tube, the latter is readily brought into intimate contact with the core, as tubes of such a kind become diminished in cross-section when pulled longitudinally. The core covered over with the tube is now dipped into a suitable cement such as is used, for example, for cores. meshes of the tube become filled up as completely as possible with the cement, in order to bring about a perfect cementing between the outer casing, the metal tube and. the core. The core-rod with. its metal covering thus prepared is now inserted in ,the carbon casing which is likewise filled with corecement, the superfluous core-material being pressed out. In this manner a deficient filling up of the intermediate space between the core-rod and the casing is avoided. The carbons are ther cried in the usual manner.

In the accompanying drawing I have shown in vertical section an arc 'nt electrodc made in accordance with my invention.

In this way the ing to the present invention.

In said drawing (1 represents the core, 5 the reticulated metal fabric tube, of which the interstices are entirely filled with core ma terial and c the outer casing of the electrode.

If, instead of finished cores being employed, the known plastic core-material only is to be used, it is preferable to insert the metal tube into the hollow carbon tube which serves as a casing and bring it into as intimate contact as possible with the casing by compression in the longitudinal direc tion, the casing being filled up afterward in the usual manner with. core-material. In this case also the meshes of the metallic .net are very perfectly filled up and a certain and good cementing between the core and casing is brought about andan excellent contact between the metallic tube and the core-material.

Besides the advantage of a good and certain contact which is particularly obtained through the large surface and the reticular construction of the tube, the arc-light electrode according to the presentinvention has the advantage that the arc is maintained on the core very much better than in other are rangemcnts, and the metal is prevented from being melted out very much better. Particularly as opposed to forms of electrodes with cores which are copper-plated, besides the advantage oi" the intimate cementing as describcd'above, arc-light electrodes which are made in accordance with the method of the present invention have the very substantinl further advantage that the core is not permeated-by the electrolytic liquid, which would be unavoidable in the case of the electrolytic production of coats of metal. Cop- 'oer is suitable in a )articularly high degree for employment as die metallic insertion for arc-light electrodes of the kind made accord- Electrodes which are made as above described bur'n exceedingly well with high current densities, and are particularly suitable for reflectors on account of the great stillness of the arc. When burning with alternating current they have the advantage that the considerable noises which arise with other carbons when burning with high current densities are infinitesimally small. a

What I claim as my invention and desire to secure by .licttcrs Patent is:

1. A method of manufacturing are light of at reticulated metal tube with core mnlerial and inserting said tube into a hollow earhon casing and drying the same.

2. A method of manilfm-tm-ing are-light electrodes, consisting in eovering 2L core with 2t reticulated metal tube, in impregnating the same with. eorwmaterial, and in inserting the core-rod thus obtained into at (ttllmll easing eontaining core-material, and in drying the Sillllf).

3. An are-light electrode,eoinpi'ising in combination av core, a reticulated metallic tube and a carbon easing inelosing the name,

the spot-es and interstices within said easing hung tilled with eore-nmteiial.

4. lien arelight electrode eomprlsmg 1n combination It core, a reticulated metallic tube cemented thereto whereby a core-rod is formed, and a, carbon easing cemented to the latter.

in testimony whereof I have signed my' mime to this specification in the presence ofthe two subscribing witnesses.

' HERMANN VIERTEL. WVitnessos:

HENRY HAsPen, WOLDEMAR HAUPT. 

